Automotive Adaptive Cruise Control Using FMCW Technology using Triangular sweep
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I am studying example of Automatic Cruise control of vehicle in matlab, The portion of Example where 'Triangular Sweep' is explained, i have some doubts about it. I think its not triangular sweep, because when i get properties of wave i get following,
Properties:
SampleRate: 150000000
SweepTime: 0.002
SweepBandwidth: 150000000
SweepDirection: 'Triangle'
SweepInterval: 'Positive'
OutputFormat: 'Sweeps'
NumSweeps: 1
Since NnmSweeps is 1, so it's still chirp up sweep not triangle sweep, for triangle sweep , the NumSweeps should be 2, but when i make this Numsweeps 2, i get the error, can you explain why you call it Triangle Sweep with 1 NumSweeps, and if it is not Triangle Sweep then how can you find ? fbu_rng and fbd_rng
Reference: %% Automotive Adaptive Cruise Control Using FMCW Technology
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Honglei Chen
2013-3-6
Hi Ali,
I assume you are simply running the script for that demo. You are right that during the one triangle period consists of two sweeps. Therefore, in the later stage, the upsweep and downsweep are separately processed. The upsweep is contained in
xr(1:2:end)
and the down sweep is in
xr(2:2:end)
The value of NumSweeps simply control how many sweeps to output each time. You can certainly do all processing if you choose to set NumSweeps to 2. However, in that case, you will need to adjust other components in the program so they expect both up and down chirp in column.
HTH
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Honglei Chen
2013-3-10
Because in the first sweep, it goes up and then in the second sweep, it goes down, and it repeats this cycle periodically.
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